You can either wait for the binaries to be released or if you’re in a rush then you can find instructions on building the binaries for yourself in the earlier article: “MySQL Cluster 7.0.7 source released“.

A description of all of the changes (fixes) that have gone into MySQL Cluster 6.3.28a (compared to 6.3.27) can be found in the MySQL Cluster MySQL Cluster 6.3.28a Change Log.